hi i know you guys can help me out with this. i just built my 12l4 and just finished it. i notice when i measure the ride height the left side is 5 front and 5.5 rear, and my right side is 5.5 front and 6 rear. i just followed the box set up. and also whats the use of the use of the tweak set screw. i mean i know the word tweak but how does that work?